Bulb-stenciling device.



- O. WINSTON.-

BULB STENCILING DEVICE.

APPLICATION FILED NOV-25.1916.

Patented Mar. 5, 1918.

2 SHEETS-SHEET I.

O. WINSTON.

BULB STENCILING DEVICE. APPLICATION man Nov. 25. 1916.

Patented Mar. 5, 1918.

2 SHEETS-SHEET 2.

. fied form of the stencilingdevice;

UNITED STATES ovna'roN WINSTON, on MINNEAIPOLI, MINNESOTA.

BULB-STENCILING DEVICE.

Specification of Letters Patent;

Patented Mar.'5,'191=8.

, Application filed Noveniber 25,1916. Serial No. 133,472.

T all whom it may concern:

Be it known .thatI, OvnR'roN WINSTON, a citizen of the United States,residing at Minneapolis, in the county of Hennepin and State ofMinnesota, have invented certain new and useful ImprovementsBulb-Stenoiling Devices; and I do hereby declare the following to be afull, clear, and exact "description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

My invention has for its object to provide an extremely simple andhighly efficient stenciling device for use in accurately, quickly andeconomically applying toelectric light bulbs, or the like, frosting orlight dimming surfaces. Generally stated, the invention consists ofthenovel devices and combinations of deviceshereinafter described anddefined in the claims.

It has been found. desirable to provide frosted surfaces or zones ofvarious differ ent shapes at proper precalculated places on the globesof electric light bulbs which are to be used for headlights forautomobiles and similar vehicles, and as above indicated, my inventionprovides a highly efiicient device for this purpose.

In the accompanying drawings which illustrate the invention, likecharacters indicate like parts throughout the several views.

Referring to thedrawings, V

Figure 1 is a bottom plan view of the imroved stencilin device: 8 1

Fig. 2 is a transverse section taken approximately on the line 22 ofFig. 1;

Fig. 3 is a section on the line 33 of Fig. l;

Fig. 1 is a transverse vertical section taken through the hood extensionof the stencil plate close to its outer end; I

Fig. 5 is a side elevation of an electric light bulb showing the mannerin which frosting is applied thereto by'the use of a stenciling device;k Fig. 6 is a bottom planview corresponding to Fig. 1, but illustratinga; slightly modi- Fig. 7.is a section taken on'the ofFig.6;

I 1 Fig. 8'is a sectionon theline -8 8-of Fig. '6;.;a

Fig; 9-is a sectiomonflthehline' 9 ,9 of

- 55: Edge 7.

like 7 7 Referring first to theconstruction illustrated in Figs; 1 to4,inclusive, "the numeral 10' indicates the body or socket memberJof thestenciling device. This member- 10 fwould Preferably be rigidly securedto any suitable support, not shown. It is formed with a'v'erticalpassage 11, which, at 1'2, joins, a concave bulbseat 13 that flarestoward but opens at the bottom ofthe said socket member] 10. Forspherical light 'bulbs, the passage 11 should be cyllndric'al' and theconcave seat 13 should be rounded.

in horizontal cross section,'and, of course, the bearing shoulder formedat 12 should also be a true circle, so that the light biilb, -whenseated against the san1e,.willfnot' have" contact with the flaringw'alls of the pocket 13.

-The stencil plate 14 isa concave convex structure formed with astencilf open1ng15,

the outline of which is such as to give the desired form of "frosting.For example, if the frostingis 'tobe applied to a-spherical light bulband is to have a circular mar-.

gin, then the stencil opening 15 should'have truecircular form. The saidstencil plate is made of thin sheet metal 'or other suitable materialwhich will spring at the edge of the the socket member 10, Here itshould be noted (see paticularly- Fig. 1) that the perforationthroughthe hinge lug 17 is of such shape and size that ,thc stencilplate may not onlyswing vertically, but may move slightly forward andrearward'and laterally. Furthermore, it will be noted that the spacingof the lugs 19 is such that there is clearance between the same and thehinge lug 17, thereby permitting the entirestencil plate'to shiftlaterally, as may be required to permit the'prop'er seating of thestencil againstfthe light bulb. At its sides, the reinforcing ring 116has outstanding lugs that a'r e ;on-

nected tolthe lower ends of coiled springs 20,

the upper ends of'which are anchoredto lugs'21on' the upper frontportion of the 1 ee k timem r a h i y I en ifi that the's'aidsprings,stand in a planethatis 90 pin 18 held by laterally spaced lugs 19' ofapproximately at a right angle to the plane of the stencil opening 15,so that they will pull the stencil against the bulb with equal pressureat all points.

At its front portion, the stencil plate 14: is secured to a hood-likeextension 22 that is of relatively heavy material and is adapted toreceive the shank of the light bulb.

The globe of the light bulb is indicated by the numeral 23, and itsmetal curved shank by the numeral 24. The metallic contact collar of thesaid shank 24 is shown as provided with the usual lock lugs or studs 25.

' Furthermore, the bulb shown has two filaments a and b, and has afrosted zone 0. In Fig. 5, the bulb is shOwn as it appears upon beingremoved from the stenciling device, but when used in the headlight itwill be turned otherside up, so that its frosting 0 and offset filament5 will be above the axis thereof.

The numeral 26 indicates a finger piece on the hood 22, and the numeral27 indicates a light leaf spring anchored within the hood and engageablewith the under surface of the shank of the light bulb. Here it may benoted that the outer end of the spring 27 terminates inward of the lugs25, so that it will not be engaged by said studs when the bulb isrotated on the axis of this shank.

Then the frosting is-to be applied to atwo-filament light bulb, or forthat matter, to a lamp having a single transversely extended filament,it is important that the frosting be applied to the bulb at the rightposition in respect to the filament, circumferentially of the bulb.Hence, to facilitate V the proper setting of the bulb, the socket member10 is provided with a peep hole or sight opening 28 that alines radiallywith the positioned bulb so that the exact position of the filamentsthereof may be observed while the bulb is held by the socket and stencilplate and rotated on its axis.

It will be noted that the stencil plate 14, as well as the pocket 13have greater divergence than the surface of the light bulb so that thebulb will be engaged only by that portion of the stencil plate that isimmediately adjacent to the stencil opening 15. This also provides forthe holding of the bulbs thatvary somewhat in diameter, that is, thatmay be somewhat smaller or somewhat larger than the bulb shown in thedrawings, and at the same time, maintains a close engagement between thelight bulb and stencil plate. When the bulb is placed in the opening ofthe stencil plate 14 and the latter is allowed to move upward under thetension of the springs 20, the light leaf spring 27 will hold the shankof the bulb so that it will engage with the short stop edge 10 of thesocket member 10, and thus set the axis of the bulb at a right angle toand .centrally of the plane of the stencil opening 15. 'The said spring27 is, however, not

- the light bulb.

applied to the glass, will produce a frosting thereon. Of course, ifdesired, the frosting can be painted on the exposed portion of the bulb.or so far as this invention is concerned, it might be produced by sandblown against tie same. Atany rate, only that portion of the bulb uponwhich the frosting or like surface is to be produced, is exposed throughthe stencil plate' The stenciling device'shown in Figs. 6 to 9,inclusive, is like'thatalreadywdescribed with the following exception oradditions to-wit, the stenciling plate here indicated by the characteris has two stencil openings 15 and 15 and further has a conicalprojection 14 alined with the top or point of It will be noted that thestencil opening 15 is circular while the opening 15' is crescent shaped.lhese openings will, of course, give correspondingly formed frostedsurfaces on the light bulb.

The free end of the spring 27 (see particularly Figs. land 9) is madeconcave'or cylindrical in cross-section, so that it fits the shank ofthe light bulb and holds the same against lateral displacement'while itis being rotated on its axis.

much better chance for the metal of the stencil plate to bespring-pressed into contact with the globe ofthebulb.

By reference to Fig. 2, it will be noted that when the bulb is appliedin the stenciling device, there is clearance between the upper portionof the stenciling plate and the lower edge portion of the socket memher,so that the springs 20 normally exert force pressing the marginal edgeof the stencil opening against the globe of the bulb. What I claim is: V

1. A bulb stenciling device comprising a socket member having an openingterminating in a flaring pocket and formed with a bulb engaging edge atthe junction between end and provided with a stencil opening.

through which a portion of the positioned bulb will be exposed forfrosting, and yielding means for pressing said stencil plate against thebulb and the bulb against the ledge of said socket member.

2. A bulb stenciling device comprising a socket member having an openingterminating in a flaring pocket and formed with a bulb engaging edge atthe junction between said opening and pocket, a stencil 'plate looselyhinged to said socket member at one end, and provided with a stencilopening through which a portion of the positioned bulb will be exposedfor frosting, said socket member having a stop for engaging the shank ofthe bulb and said stencil plate having a yielding member engageable withsaid bulb shank to press the same against said stop.

3. A bulb stenciling device comprising a socket member having an openingterminating in a flaring pocket and formed with a bulb engaging edge atthe junction between said opening and pocket, a stencil plate looselyhinged to said socket member at one end, and provided with a stencilopening through which a portion of the positioned bulb will be exposedfor frosting, said socket member having a stop for engaging the shank ofthe bulb and said stencil plate having a yielding member engageable withsaid bulb shank to press the same against said stop, the said partsholding said bulb with freedom for rotation.

4:. A bulb stenciling device comprising a socket member having anopening terminating in a flaring pocket and formed with a bulb engagingedge at the junction between said opening and pocket, a stencil plateloosely hinged to said socket member at one end and provided with astencil opening through which a portion of the positioned bulb will beexposed for frosting, and springs connecting the opposite sides of saidstencil plate to the opposite sides of said socket member.

5. A bulb stenciling device comprising a socket member having an openingterminating in a flaring pocket and formed with a bulb engaging edge atthe junction between said opening and pocket, a stencil plate looselyhinged to said socket member at one end, and provided with a stencilopening through which a portion of the positioned bulb will be exposedfor frosting, and.

springs connecting the opposite sides of said stencil plate to theopposite sides of said socket member, the said springs being extended ina plane at a right angle to the plane of the stencil opening of saidstencil plate.

6. A bulb stenciling device comprising a socket member and a stencilingplate hinged thereto and cooperating therewith to hold a light bulb witha portion exposed through said stencil plate, a spring yieldinglypressing said stenciling plate against the bulb and thelatter againstsaid socket member, and a spring carried by said stenciling plateand'engageable with the shank of the bulb to position the same against astop on said ,stenciling member.

7. A bulb stenciling device comprising a socket member and a stencilingplate hinged thereto and cooperating therewith to hold a light bulb witha portion exposed through said stenciling plate, a spring yieldinglypressing said stenciling plate against the bulb and the latter againstsaid socket memher, and a spring carried by said stenciling plate andengageable with the shank of the bulb to position the same against-astop on said stenciling member, the free end of said spring beingconcave in cross section to fit the shank of the bulb.

In testimony whereof I affix my signature in presence of two witnesses.V

" OVERTON WINSTON. \Vitnesses BERNIOE Gr. WVHEELER, HARRY D. KrLeoRn.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, 10.0. V

